"The official name for the exclamation mark or bash character is a pling." [my emphasis]

It seems that, unless I set up an account, I'm missing some of the information presented; nonetheless, this does look more like a definition of pling than a definition of exclamation mark.

From "The Unicode Standard, Version 15.0" list of character names: (link to PDF) "C0 Controls and Basic Latin (Range: 0000–007F)".

U+0021 ! EXCLAMATION MARK

Informative alias list:
    = factorial
    = bang
Cross-reference list (items start with '→'): 9 entries.

U+0023 # NUMBER SIGN

Informative alias list:
    = pound sign (weight)
    = hashtag, hash
    = crosshatch, octothorpe
Informative note list (items start with '•'): 1 entry re musical sharp.
Cross-reference list (items start with '→'): 5 entries including some characters mentioned elsewhere in this thread (e.g. ℔ and ♯).